Preheat oven to 350°F. Line a 9x13 inch baking dish with parchment paper and set aside.
Unwrap caramels and place in a small saucepan or microwave safe bowl along with butter and sweetened condensed milk.
11 ounces caramels, 14 ounces sweetened condensed milk, 4 tablespoons unsalted butter
Melt in microwave at medium heat in 30 second bursts or over medium-low heat, stirring occasionally, until caramels have fully melted and the mixture is nice and smooth. Set aside.
Combine flour, oats, baking powder, and salt in a small mixing bowl. Set aside.
2 cups all purpose flour, 1 cup old fashioned oats, 2 ½ teaspoons baking powder, 1 teaspoon salt
Cream butter, peanut butter and brown sugar together in a large mixing bowl or the bowl of a stand mixer.
12 tablespoons unsalted butter, ½ cup creamy peanut butter, 2 cups light brown sugar
Add eggs one at a time, mixing well after each egg. Add in vanilla extract.
2 large eggs, 1 tablespoon vanilla extract
Add the flour mixture slowly stirring until well combined.
Stir in the chocolate chips, peanut butter chips, and toffee bits.
2 cups semi-sweet chocolate chips, 1 cup Reese's peanut butter chips, 1 cup Heath toffee bits
Spread two-thirds of the dough on the bottom of the pan.
Slowly pour caramel mixture evenly over the dough.
Drop the remaining dough on top by the teaspoon. It doesn't have to be perfect!
Bake for about 30 minutes or until golden brown on top and set. Let cool completely and then cut into bars.